Gamuts

Joint effusion

A joint effusion is the presence of increased intra-articular fluid. It may affect any joint. [Source: Wikipedia ]

May Cause
Juxta-articular soft-tissue mass
May Be Caused by
 Common
Gout
Infectious arthritis
Juvenile rheumatoid arthritis
Lyme disease
Psoriatic arthritis
Reiter syndrome
Rheumatoid arthritis
Synovitis
Trauma with hemorrhage
 Uncommon
Acute rheumatic fever
Allergic reaction
Arthritis
Avascular necrosis
Bleeding tendency
Calcium pyrophosphate dihydrate crystal deposition disease
Drug reaction
Hemangioma
Hemophilia
Insect bite
Juvenile chronic arthritis
Leukemia
Lymphoma
Metastatic bone neoplasm
Neuropathic arthropathy
Pigmented villonodular synovitis
Primary bone neoplasm
Sickle cell disease
Synovial neoplasm
Synovial osteochondromatosis